CVE-2023-3867 (GCVE-0-2023-3867)

Vulnerability from cvelistv5 – Published: 2025-08-16 13:29 – Updated: 2026-08-05 09:09
VLAI
Title
ksmbd: fix out of bounds read in smb2_sess_setup
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix out of bounds read in smb2_sess_setup ksmbd does not consider the case of that smb2 session setup is in compound request. If this is the second payload of the compound, OOB read issue occurs while processing the first payload in the smb2_sess_setup().
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 676392184785ace61e939831e7ca44a03d438c3b (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < ef572ffa8eb44111eed2925fbb2adca78bdcbf61 (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 2ba03cecb12ac7ac9e0170e251543c56832d9959 (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 98422bdd4cb3ca4d08844046f6507d7ec2c2b8d8 (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.145 , ≤ 5.15.* (semver)
Unaffected: 6.1.40 , ≤ 6.1.* (semver)
Unaffected: 6.4.5 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
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              "value": "AV:N - ksmbd is an in-kernel SMB server reachable over TCP/445; the bug is in smb2_sess_setup processing of network SMB2 compound PDUs, so a remote attacker can trigger it by sending crafted packets.\nAC:L - The attacker fully controls the compound request layout (e.g., ECHO then SESSION_SETUP) and the misinterpreted SecurityBufferOffset/Length bytes in the first PDU, so the OOB read is reliably triggered with no conditions outside attacker control.\nPR:N - SMB2 SESSION_SETUP is a pre-authentication path; smb2_check_user_session explicitly exempts it (and ECHO), so no credentials or prior session are required.\nUI:N - Exploitation requires only sending SMB2 packets to a reachable ksmbd instance; no victim user action is needed.\nS:U - Impact is confined to the host kernel running ksmbd (memory disclosure/crash); this is a standard kernel vulnerability, not a cross-authority escape such as guest-to-host.\nC:H - Using smb2_get_msg(request_buf) on a non-first compound SESSION_SETUP misreads attacker-influenced offset/length fields and performs an unbounded OOB read past the request buffer; SPNEGO decoding can even copy that kernel memory into mechToken, enabling substantial information disclosure.\nI:N - The vulnerability is an out-of-bounds read; the incorrect response pointer only corrupts the attacker-facing response buffer within its allocation and does not provide an arbitrary kernel write primitive.\nA:H - An attacker-controlled OOB read past the allocated request buffer into unmapped or invalid memory can oops/panic the kernel, fully denying availability of the host."
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    "dateReserved": "2023-07-24T14:52:44.448Z",
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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-04T13:18:21+00:00",
      "cve": "CVE-2023-3867",
      "id": "CVE-2023-3867",
      "initial_release_date": "2023-07-20T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Out of bounds read in smb2_sess_setup",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-3867.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.